Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1987FIREBIRD V8-350 5.7LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSSEIZED A/C COMPRESSOR SERVICE
1987 Pontiac Firebird V8-350 5.7L
Seized A/C Compressor Service
1987 Pontiac Firebird V8-350 5.7LSECTION Seized A/C Compressor Service
Number 83-T-54 Section 1 Date 08/83
Subject: SEIZED A/C COMPRESSOR SERVICE
When service of any seized compressor is required, it is important to accurately inspect the complete system for leaks and eliminate the cause. All hoses, connections, evaporator and condenser should be leak tested after the compressor is repaired.
Before recharging the system, the orifice tube should be removed and cleaned to remove any debris or contaminants.
When evacuating the A/C system in preparation for recharging, if a 711.2 to 736.6 mm (28" to 29") vacuum cannot be held for five minutes, the system has a leak.
In all evacuation procedures, the specification of 711.2 to 736.6 mm (28" to 29") vacuum is used. This specification can only be reached at or near sea level. For each 304.8 m (1,000 feet) above sea level, the specification should be lowered by one inch of vacuum.
After charging, the system should be closely inspected for leaks with the most accurate leak detector available. Special attention should be given to all hoses and fittings as these are often overlooked, yet frequently are the leak source. An accumulation of dirt and oil at a fitting is a good indication of a leak. ALL leaks should be repaired prior to releasing the vehicle to avoid subsequent costly compressor repairs.
Subject: SEIZED A/C COMPRESSOR SERVICE
When service of any seized compressor is required, it is important to accurately inspect the complete system for leaks and eliminate the cause. All hoses, connections, evaporator and condenser should be leak tested after the compressor is repaired.
Before recharging the system, the orifice tube should be removed and cleaned to remove any debris or contaminants.
When evacuating the A/C system in preparation for recharging, if a 711.2 to 736.6 mm (28" to 29") vacuum cannot be held for five minutes, the system has a leak.
In all evacuation procedures, the specification of 711.2 to 736.6 mm (28" to 29") vacuum is used. This specification can only be reached at or near sea level. For each 304.8 m (1,000 feet) above sea level, the specification should be lowered by one inch of vacuum.
After charging, the system should be closely inspected for leaks with the most accurate leak detector available. Special attention should be given to all hoses and fittings as these are often overlooked, yet frequently are the leak source. An accumulation of dirt and oil at a fitting is a good indication of a leak. ALL leaks should be repaired prior to releasing the vehicle to avoid subsequent costly compressor repairs.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.